An Authentication Protocol using Ultrasonic Ranging

Rene Mayrhofer, Hans Gellersen, Mike Hazas

Research output: Working paperWorking paper/discussion paper


This report presents a method for establishing and securing spontaneous interactions on the basis of spatial references which are obtained by accurate sensing of relative device positions. Utilising the Relate ultrasonic sensing system, we construct an interlocked protocol using radio frequency messages and ultrasonic pulses for verifying that two devices share a secret. This verification is necessary to prevent man-in-the-middle attacks on standard Diffie-Hellman key agreement.
Original languageEnglish
Publication statusPublished - 2006


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